patch 9.0.0839: test may fail depending on sequence of events

Problem:    Test may fail depending on sequence of events.
Solution:   Accept error codes in either order. (Yee Cheng Chin,
            closes #11510)
diff --git a/src/version.c b/src/version.c
index 6aef2c1..c454557 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    839,
+/**/
     838,
 /**/
     837,